Couch312

Hidden Strings is also a great blue sorcery.

For one extra mana cost you could replace the azorius arrester's with banisher priests. Just a thought, since the banisher priest exile usually lasts a little longer than detain.
All around it is a solid deck.

I also have a white/blue deck, if you want to look at it.
http://www.mtgvault.com/couch312/decks/wanna-lose-a-friend/

My first deck was very similar to this one back in mirrodin. Gotta love Broodstar and affinity.